Quote Originally Posted by roccol View Post
Furnace: Lennox GV32V5-100-5

Dash the return duct is not 8 x 30, it is 26 x 8.
My bad.
8X26 ,800 cfms ,.04 FR ,600 fpm,still okay.However I think your cfms for high stage heat will be much graeter and may be in the unaccectable range.Maybe someone can post the required cfms for the furnace.